If the smoke is completely white, it is water vapor and can come out of the tailpipe depending on the weather.
If you do not have overheating or coolant losses, ther is nothing to worry about.
If it is slightly bluish or grey, that is oil being burnt. This would happen to most cars when the engine reaches a certain age. If the oil consumption is minor, it is still not time to be worried but you need to keep an eye on the oil level.
Saturday, September 5th, 2015 AT 9:05 AM